Method of noise cancellation in a signal generated by discrete multi-tone modulation and circuit for carrying out said method
AssigneeInfineon Technologies AG
InventorsHeinrich Schenk, Stefan Schneider, Dietmar Straeussnigg
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Abstract
The invention relates to a method of canceling noise in a signal generated by discrete multi-tone modulation. The noise is caused primarily by the transient of a transmission channel via which the signal is transmitted. The signal comprises a plurality of symbols each of which is preceded by a cyclic prefix. According to the invention, a plurality of parameters is calculated from the digitized sample values of the signal and the approximate transient of the transmission channel is calculated from said plurality of parameters. To cancel the noise the approximately calculated transient is subtracted from the digitized sample values.
Claims12
A method for the compensation of interference in a signal generated by discrete multitone modulation, the interference essentially being caused by the transient process of a transmission channel via which the signal is transmitted, the signal having a multiplicity of symbols with digitized samples and each symbol being preceded by a cyclic prefix with digitized samples, the method having the following steps:
- feeding of the digitized samples of the signal to a serial/parallel converter (15);
- calculation of a difference between at least one digitized sample of a symbol and a digitized sample of the cyclic prefix preceding the symbol by means of at least one subtractor circuit (16), thereby determining interference;
- calculation of the transient process of the transmission channel from the determined interference by means of multiplier circuits (17, 18);
- and
- calculation of a difference between the calculated transient process and the digitized samples of the symbol.
Dependencies are inferred from the claim text.